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Figure 15. Tractor Park Brake Solenoid.
Figure 16. Testing Control Pressure at Scraper Park Brake Solenoid.

Field Maintenance Manual For Military 621G Scraper -2 Page Navigation
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TM 5-3805-296-23-2
0114
Table 1. Service or Parking Brakes Do Not Release Correctly Continued.
0114
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Service or Parking Brakes
Do Not Release Correctly -
Valved nipple 6V-3966 and quick disconnect hose 177-7861 are from
Continued
Gauge, Pressure Kit 1U-5482.
4. Install valved nipple
(Figure 16, Item 5) on pipe bushing
(Figure 16, Item 4).
5. Install pipe bushing
(Figure 16, Item 4) on fitting
(Figure 16, Item 3).
6. Connect quick disconnect hose
(Figure 16, Item 1) on valved
nipple (Figure 16, Item 5).
7. Position gauge (Figure 16, Item 2)
where it can be easily read while
assistant operates parking brake.
8. Turn battery disconnect switch to
ON position and start engine. Idle
engine for 20 minutes or until air
pressure gauge reaches normal
operating pressure
(TM 5-3805-296-10).
9. Have assistant set park brake
switch to engage (brake on)
position. Read pressure gauge
(Figure 16, Item 2). Have assistant
set park brake switch to disengage
(brake off) position
(TM 5-3805-296-10). Record
reading as control pressure.
0114-28


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